Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39893c06041f9e8…

MALICIOUS

PDF

42.9 KB Created: 2021-05-16 15:20:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7e7f917b2dad14019b5c31f510a8f59f SHA-1: 7fdbc81408815016830e231a5ac263e4f4cd0ad0 SHA-256: e39893c06041f9e8f25cfc1519b7c59a8c0f3fc418598311404d1abc4f14d8e4
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to known malicious redirectors and websites offering free game currency or hacks, such as 'roblox-skins-boy-free-game-hack'. These lures are designed to trick users into visiting potentially harmful sites. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/431946152/roblox-skins-boy-free-game-hack In PDF document text
    • http://teksomak.com/images/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://teksomak.com/images/coin-master-free-spins-16-04-19_GM406889139.pdfIn PDF document text
    • http://teksomak.com/images/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://teksomak.com/images/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://teksomak.com/images/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://teksomak.com/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://teksomak.com/images/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://teksomak.com/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://teksomak.com/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://teksomak.com/images/coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://teksomak.com/images/coin-master-35-16-hack-apk_GM406889139.pdfIn PDF document text
    • http://teksomak.com/images/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://teksomak.com/images/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://teksomak.com/images/coin-monster_GM406889139.pdfIn PDF document text
    • http://teksomak.com/images/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://teksomak.com/images/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://teksomak.com/images/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://teksomak.com/images/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://teksomak.com/images/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://teksomak.com/images/coin-master-free-spins-cheat-codes_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004957.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4957 25636 bytes
SHA-256: 7a0280ef8de881fc4ea45bdb7cc6277f0f948abba686a676ad1ddef2e4f17f0c
font_01_sfnt_off000084f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84F0 18420 bytes
SHA-256: f34de68c913d1c931e579594a611635df95b6f402bf6c6d3ef5f8f4a3ceebe71

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